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J. I'. HARDY. FEED MBCHANISM PoR SEWING MAGHINBS.

No. 550,930. Patentedec. 3, 1895.

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J. F. HARDY V y FEED MEGHANISM FOR SEWING MACHINES. No. 550,930.PatentedDec. 5, 1895; y

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UNITED STATES PATENT GFFICE.

JAMES F. HARDY, OF NEW YORK, N. Y.

FEED MECHANISM FOR SEWING-MACHINES.

SPECIFICATION .To ZZZ whom t may concern:

Be it known that I, JAMES F. HARDY, of the city and county of New York,in the State of New York, have invented a new and useful Improvement inFeed Mechanisms for Sew.- ing-Machines, of which the following is aspecification.

My invention relates to an improvement in feed mechanisms forsewing-machines, with the object in view of providing a simple andeffective means for regulating the length of stitch at pleasure, eitherwhile the machine is running or at rest.

The particular style of machine which I have chosen to illustrate mystructure and operation of the stitch-regulating mechanism is what isknown in the art as the singlethread7 or Willcox & Gibbs type; but Ihave introduced into the drawings only such parts as are necessary toillustrate the operation of the feed itself.

In the accompanying' drawings, Figure l is a view of the machine-tablein end elevation, showing the feed-dog and the operative parts inimmediate connection therewith as in use. Fig. 2 is aview of the same invertical section from front to rear, taken through the table and thefeed-operating parts at a point back from the end beyond thetable-support. Fig. 3 is a horizontal section through line :c of Fig. 1.Fig. 4L is an enlarged view in detail, partly in section, showing theconnection of the feed-dog support with the drive-shaft. Fig. 5 isanenlarged view in detail showing in front elevation the depending platefor holding the stitch-regulating lever in the desired adjustment. tioncorresponding to that of Fig. 2, showing a modified structure andarrangement of the stitch-regulating lever and mechanism Afortransmitting the longitudinal movement to the feed-dog; and Fig. 7 is ahorizontal section corresponding tothat of Fig. 3 of said modifiedstructure and arrangement of parts.

The drive shaft extending horizontally from a suitable power-applyingdevice of any well-known or approved form is denoted by A. It issupported near its end in a standard or end support B, to which thetable C is secured, as is common. The end of the drive shaft A, whichprojects through the support B, is providedwithV an eccentric @,fixedthere- Fig. 6 is a vertical secon for imparting to the feed-dog supportD,and hence to the feed-dog d, fixed to the support D, its reciprocatingvertical movement. The feed-dog support D has its end forked, formin arecess CZ for the reception of the eccentric a, and its opposite end isprovided with an open slot (Z2 for embracing the shank of a studpin orscrew b, engaged in the support B. The eccentric a referred to ispreferably formed by reducing the end of the shaft A, and it is providedwith a wearing-sleeve a', which has end rims a2 and a3 for holding theforked end of the dog D in position thereon. The wearing-sleeve a may besecured in position by means of a screw c4, engaged in the end of theeccentric a.. It is to the means for imparting to the feed-dog support Dits longitudinal reciprocating movement that my present inventionparticularly relates, and this I accomplish as follows:

The dog-support D is provided with a studpin (Z3, which extendslaterally from it through an opening b in the support B. A vibratingarm'E is provided with an elongated slot e and is pivoted, as at e',Fig. 2, to swing in a vertical plane forward and backward. rlhe arm Eisprovidedwith recesses e2 in its free end for the reception of a cam a5on the shaft A.

A connecting arm or link F -is provided at one end with an elongatedrecess f, adapted to lreceive the pin (Z3 on the feed-dog support D, andat its opposite end it is provided withv a head-piece f', adapted toengage and slide alongvv'ithin the elongated slot e in the vibrating armE. The said head-piece or slide f is provided with a projecting stud orpin f2, engaged within elongated slots g in the bif urcated end of anoperating-lever G, pivoted, in the present instance, at g on a lug whichdepends from the support B, its operating end v extending forwardlythrough a slot c' in a plate c, depending from the front of the table C.The wall along one edge of the slot c is provided with notches c2 forretaining a nose or rib g2 on the side of the operating-lever G,

the latter being preferably made of spring metal and having a tendencyto spring toward the notches c2. The notches c2 are at predeterminedintervals, and a scale corresponding to the notches is, in the' presentinstance,

vprovided with numbers which indicate the IOO formed when thestitclrregulating lever is in the notch corresponding to that number.

In operation the cam d5 and the eccentric (t having been so adjustedupon the shaft A as to produce the desired longitudinal movement of thefeed-dog at the proper periods of time with respect to its verticalreciprocating movement the length of the longitudinal movement of saidfeed-dog may be varied by operating the lever G to move the link or armF farther away from or nearer to the pivotal point ef of the vibratingarm E. Thus when the link F occupies the position shown in Fig. 2 theeffect of the vibratory movement of the arm E under the rotary movementof the cam ai will 'be comparatively slight, and hence it will impart tothe pin (Z3, and hence to the dog-support D and dog d, a comparativelyshort longitudinal movement; but on the other hand, when the arm F ismoved by the lever G into the position shown in dotted lines in Fig. 2,the vibra-tory movement of the arm B will be very much greater, andhence the longitudinal movement of the dog-support D and dog (l will becorrespondingly increased.

The modified structure represented in Figs. G and 7 operates inprinciple quite like that already described, the principal differencebetween the two being that the operating-lever represented in Figs. Gand 7 by G' moves in a horizontal plane, as does also the vibrating armE, corresponding to the vibrating arm E already described. The vibratingarm E' has its end in which the recess e2 for receiving the cam 0.5 islocated turned upwardly at right angles to its body portion, and theconnecting link or arm F', corresponding to the link F alreadydescribed, in this instance eX- tends upwardly from' its head-piece f toengage the stud-pin d3, fixed to the dog-support D. In this instance theoperating-lever G' engages a series of notches c3 along the lower edgeof the depending plate c, and a scale, quite similar to that shown inFig. 5, may be arranged horizontally along the foot of said plate.

I have provided in each instance for taking up of any wear of theoperating-levers G or Gr' at their pivotal supports by making the pivota screw. (Represented by g3.)

What I claim is- 1. In combination, a suitable standard, a rotary shaft,a feed dog and its support, an ec centric on the said shaft forming asupport for and imparting a vertical motion to the feed dog support, acam carried by said rotary shaft, a slotted vibrating arm pivoted to thestandard and engaged with said cam, a link engaged with said slotted armand connected with the feed dog support and an operating lever formoving the said link along the said slotted vibrating arm to vary thethrow of the feed dog, substantially as set forth.

2. In combination, a suitable standard, a rotary shaft, a feed dog andits support, an eccentric on the shaft forminga support for andimparting a vertical motion to the feed dog support, a cam carried bysaid Vrotary shaft, a slotted vibrating arm pivoted to the standard andengaged with said cam, a link engaged with said slotted arm andconnected with the feed dog support, an operating lever for moving thesaid link along the said vibrating arm to vary the throw of the feeddog, a scale in proximity to the said operating 1ever, and means forpositively retaining the said operating lever at different points alongthe scale, substantially as set forth.

In combination, a suitable standard, a rotary shaft, a feed dog and itssupport, a pin extending laterally from said dog support, an eccentricon the shaft forming a support for and imparting a vertical motion tothe feed dog support, a cam carried by said rotary shaft, a slottedvibrating arm pivoted to the standard and engaged with the said cam, alink engaged with said slotted arm, said link having an elongated slotengaging the later ally extended pin, and an operating lever for movingthe said link along the slotted vibrating arm to vary the throw of thefeed dog, substantially as set forth.

JAMES F. HARDY.

"Witnesses z FREDK. I-IAYNEs, GEORGE BARRY.

